Discovery and Clinical Validation of C1M and C4M as Soluble Biomarkers for Diagnosis, Prognosis, and Symptom Prediction in Psoriatic Disease and Other Inflammatory Arthropathies

Psoriatic disease (PsD) is a complex, heterogeneous disease with unmet medical needs in terms of its diagnosis, management, and prognosis. The identification of biomarkers could improve the implementation of precision medicine in PsD, but to date, none of these biomarkers have been clinically validated. Biomarkers can support clinical trials in several ways, including (1) diagnostics, (2) drug pharmacodynamics, (3) prognostics for patient selection and monitoring of drug efficacy, and (4) predictive models for clinical outcomes. Biomarkers can sometimes be used for both diagnosis and prognosis. Benefits of biomarkers use may include shorter duration of clinical trials, faster access to new treatments, and a personalized approach to disease management. Several potential biomarkers have recently demonstrated promise for use in PsD, including C1M, a serum biomarker reflecting collagen type I collagen degradation, and C4M, a type IV collagen metabolite, but clinical validation has not yet been completed. Here, and as presented at the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis 2024 annual meeting, we summarize the status of biomarker discovery for PsD and their overlap with other musculoskeletal diseases such as rheumatoid arthritis and axial spondyloarthritis.